The ornamental design for an interlockingpillow, as shown and described.
FIG. 1 is a top perspective view of the interlocking pillow of the present invention in an assembled position, the bottom perspective view being a mirror image thereof;
FIG. 2 is a top plan view of the interlocking pillow thereof, the bottom plan view being a mirror image thereof;
FIG. 3 is a front elevation view of the interlocking pillow thereof, the rear elevation view being a mirror image thereof;
FIG. 4 is a right side elevation view of the interlocking pillow thereof, the left side view being a mirror image thereof;
FIG. 5 is an exploded top perspective view of the interlocking pillow of the present invention; and,
FIG. 6 is an exploded bottom perspective view thereof.